A great article on the BBC about "uptalk" and I'll confess I find it annoying, but no doubt I do it as well.
eg When someone tells you something, then ends the sentence with a higher pitch which then makes the statement sound like a question, or is asking for your re-assurance that the statement is correct. Or is it? 
The blame seems to be split between Americans, Northern Irish or Australians, in particular the Australian Neighbours soap 
Here's a good quote from the article, which can be seen here:
The unstoppable march of the upward inflection? - BBC
Sharyn Collins, a voice coach and elocution expert, has strong opinions on uptalk. "It's perfectly fine in Australia, New Zealand and America," she intones in a cut-glass accent. "But not here [in the UK], I believe. We've adopted it in a different way."
Some people believe the phenomenon is used by uncertain speakers hoping to win their audience over. It acts as a constant check that listeners follow - phrasing every sentence, no matter how declarative, is a subconscious begging by the speaker to be reassured. It's a use Robin Lakoff first noticed 40 years ago. "The effect," she wrote, "is as though one were seeking confirmation, though at the same time the speaker may be the only one who has the requisite information."
Have you noticed people doing this, does it bother you, or do you do it yourself?
